Soft-drink makers, restaurateurs and other businesses are suing to block the city's move to end the sale of super-sized, sugary drinks in many eateries.
The American Beverage Association and others sued the city Friday. City officials had no immediate response.
The city Board of Health approved the unprecedented regulation last month. It would stop restaurants, cafeterias and concession stands from selling soda and other high-calorie drinks in containers larger than 16 ounces.
The rule is set to take effect in March.
Mayor Michael Bloomberg calls it a reasonable, promising way to curb obesity.
The lawsuit says the unelected health board shouldn't be telling people how much soda to drink. The suit also says the rule "burdens consumers and unfairly harms small businesses."